#---------------------------------------------------------------------------------
.SUFFIXES:
#---------------------------------------------------------------------------------
ifeq ($(strip $(DEVKITARM)),)
$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
endif

include $(DEVKITARM)/ds_rules

#---------------------------------------------------------------------------------
# BUILD is the directory where object files & intermediate files will be placed
# SOURCES is a list of directories containing source code
# INCLUDES is a list of directories containing extra header files
# DATA is a list of directories containing binary files
# all directories are relative to this makefile
#---------------------------------------------------------------------------------
BUILD		:=	build
SOURCES		:=	source  
INCLUDES	:=	include
GBFSDIR		:=	data  
ARM9DIR		:=	~/coding/gba-ds/dmc/arm9

LIBFAT		:=	$(DEVKITPRO)/libfat
#USERFLAGS	:=	-DUSE_GBFS

#---------------------------------------------------------------------------------
# options for code generation
#---------------------------------------------------------------------------------
ARCH	:=	-mthumb -mthumb-interwork

# note: arm9tdmi isn't the correct CPU arch, but anything newer and LD
# *insists* it has a FPU or VFP, and it won't take no for an answer!
CFLAGS	:=	-g -Wall -O2\
			-mcpu=arm9tdmi -mtune=arm9tdmi -fomit-frame-pointer\
			-ffast-math \
			$(ARCH)

CFLAGS	+=	$(INCLUDE) -DARM9 $(USERFLAGS)
CXXFLAGS	:=	$(CFLAGS)

ASFLAGS	:=	-g $(ARCH)
LDFLAGS	=	-specs=ds_arm9.specs -g $(ARCH) -mno-fpu -Wl,-Map,$(notdir $*.map)

#---------------------------------------------------------------------------------
# any extra libraries we wish to link with the project
#---------------------------------------------------------------------------------
LIBS	:= -lfat -lnds9

#---------------------------------------------------------------------------------
# list of directories containing libraries, this must be the top level containing
# include and lib
#---------------------------------------------------------------------------------
LIBDIRS	:=	$(LIBNDS) $(LIBFAT)

#---------------------------------------------------------------------------------
# no real need to edit anything past this point unless you need to add additional
# rules for different file extensions
#---------------------------------------------------------------------------------
ifneq ($(BUILD),$(notdir $(CURDIR)))
#---------------------------------------------------------------------------------

export ARM9BIN	:=	$(TOPDIR)/$(TARGET).arm9
export ARM9ELF	:=	$(CURDIR)/$(TARGET).arm9.elf
export DEPSDIR	:=      $(CURDIR)/$(BUILD)

export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
					$(CURDIR)/$(GBFSDIR)

CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))

export GBFSFILES	:= $(notdir $(wildcard data/*.*))

#---------------------------------------------------------------------------------
# use CXX for linking C++ projects, CC for standard C
#---------------------------------------------------------------------------------
ifeq ($(strip $(CPPFILES)),)
#---------------------------------------------------------------------------------
	export LD	:=	$(CC)
#---------------------------------------------------------------------------------
else
#---------------------------------------------------------------------------------
	export LD	:=	$(CXX)
#---------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------

export OFILES	:=	$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)

export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
			-I$(CURDIR)/$(BUILD)

export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)

.PHONY: $(BUILD) clean

#---------------------------------------------------------------------------------
$(BUILD):
	@[ -d $@ ] || mkdir -p $@
	@make --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile

#---------------------------------------------------------------------------------
clean:
	@echo clean ...
	@rm -fr $(BUILD) *.elf *.nds* *.bin 


#---------------------------------------------------------------------------------
else

DEPENDS	:=	$(OFILES:.o=.d)

#---------------------------------------------------------------------------------
# main targets
#---------------------------------------------------------------------------------
$(ARM9BIN)	:	$(ARM9ELF)
	@$(OBJCOPY) -O binary $< $@
	@echo built ... $(notdir $@)

$(ARM9ELF)	:	$(OFILES)
	@echo linking $(notdir $@)
	@$(LD)  $(LDFLAGS) $(OFILES) $(LIBPATHS) $(LIBS) -o $@

#---------------------------------------------------------------------------------
# you need a rule like this for each extension you use as binary data 
#---------------------------------------------------------------------------------
#%.gbfs.o : %.gbfs
#	@echo $(notdir $<)
#	@$(bin2o)

%.gbfs :
	@cd $(ARM9DIR)/data && gbfs $(ARM9DIR)/$(BUILD)/$@ $(GBFSFILES)

-include $(DEPENDS)

#---------------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------------
